DocumentCode :
2582565
Title :
Ultra low-power RFID tag with precision localization using IR-UWB
Author :
Zhou, Yuan ; Law, Choi Look ; Xia, Jingjing
Author_Institution :
Positioning & Wireless Technol. Centre, Nanyang Technol. Univ., Singapore, Singapore
fYear :
2011
fDate :
5-10 June 2011
Firstpage :
1
Lastpage :
4
Abstract :
Radio-frequency identification (RFID) tag using Impulse Radio Ultra Wideband (IR-UWB) is promising for ultra low power consumption and precise localization in indoor cluttered environment. For many logistic applications, ultra low power tag with precision localization is often the most critical requirement. An ultra low-power RFID tag with precise localization is proposed in this paper. The RFID tag is a transmitter comprising of a micro-controller board and a UWB impulse radio board. Power saving and precision localization is achieved by optimization of the circuit design for ultra short pulses as well as system architecture and operation. The tag consumes 20 uA when pulsing at 10 KHz rate with 15.5 dBm peak transmit power. When 1 s sleep mode is incorporated with 1 ms active mode, the average current consumption is 4 uA. The transmitted pulse is captured by energy-detection receivers at the readers. The received signal is sampled in real time. The limited sampling rate reduces the resolution in time delay estimation, and hence deteriorates the ranging precision. To recover the time resolution, curve fitting technique is applied. Measurement in a 6m×6m typical indoor environment demonstrates that the proposed system is able to achieve positioning accuracy of 10 cm. Due to the high sensitivity of the receiver (-71 dBm), the proposed system can achieve a potential reading range of over 100 meters.
Keywords :
curve fitting; delays; microcontrollers; radiofrequency identification; ultra wideband communication; IR-UWB; current 20 muA; curve fitting technique; energy-detection receivers; frequency 10 kHz; impulse radio ultrawideband; indoor cluttered environment; logistic applications; radiofrequency identification; time delay estimation; ultralow-power RFID tag; Distance measurement; Estimation; Generators; Position measurement; Radiofrequency identification; Receivers; Time of arrival estimation; Ultra low-power RFID; Ultra wideband technology; impulse radio; position measurement; time of arrival estimation;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Microwave Symposium Digest (MTT), 2011 IEEE MTT-S International
Conference_Location :
Baltimore, MD
ISSN :
0149-645X
Print_ISBN :
978-1-61284-754-2
Electronic_ISBN :
0149-645X
Type :
conf
DOI :
10.1109/MWSYM.2011.5972647
Filename :
5972647
Link To Document :
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